Micro Eval

Question 1

normal flora in skin

Answer 1

• Staphylococci (CNS)
• Streptococci
• Diphtheroids

Question 2

normal flora in mouth

Answer 2

• Streptococci
• Neisseria sp.
• Haemophilus sp.
• Bacteroides sp.

Question 3

normal flora in GU tract

Answer 3

• Enterobacteriaceae
• Lactobacillus sp.
• Staphylococci

Question 4

normal flora in GI tract

Answer 4

• Enterobacteriaceae
• Bacteroides sp.
• Clostridium sp.
• Streptococci (anaerobics)
• Enterococci

Question 5

Gram-Positive Cocci

Answer 5

• Staphylococcus aureus (coagulase-positive)
• Staphylococcus epidermidis (coagulase-negative)
• Streptococcus pneumoniae (alpha-hemolytic)
• Streptococcus pyogenes (beta-hemolytic, Group A)
• Enterococcus faecalis, E. faecium (gamma-hemolytic)
• Peptostreptococcus (anaerobe)

Question 6

Gram-Positive Bacilli

Answer 6

• Lactobacillus (frequently a contaminant)
• Diphtheroids (frequently a contaminant)
• Clostridium difficile (anaerobic, toxin-producing bacteria in GI tract)

Question 7

Gram-Negative Bacilli

Answer 7

• Escherichia coli
• Klebsiella sp.
• Proteus sp.
• Enterobacter sp.
• Pseudomonas aeruginosa (oxidase-positive)
• Acinetobacter sp. (oxidase-negative)
• Bacteroides fragilis (strict anaerobe)

Question 8

Gram-Negative Cocci

Answer 8

• Moraxella catarrhalis (diplococci)

- Neiserria gonorrhoeae, N. meningitidis (diplococci)